Project example: a 55-inch TV and soundbar on an interior partition in a townhome off the main boulevard — what it looks like and what it costs

The scenario

The unit is a two-level townhome in a row of attached homes. The living room is on the ground floor, with the wall on one side shared with the neighbor, a staircase on the other and a short interior wall facing the sofa. The outlet sits on that interior wall at floor height.

The request is a 55-inch TV with a soundbar under it, placed so it can be watched from the sofa. The obvious spot is the shared wall, which is wider and has an outlet, but the neighbor's side of it would carry the sound and the association's rules may limit holes in it. The interior wall facing the sofa avoids the question.

The framing of the interior wall is not known in advance. In buildings of this kind it can be wood studs or light steel studs, and the fasteners are different, so the installer identifies the framing with a probe hole before choosing the hardware.

What the job involves

1. The owner has read the association's current rules or asked the management office, and confirms the interior wall is free for a mount.
2. The installer taps the wall, uses a stud finder and drills one small probe hole to learn whether the framing is wood or steel.
3. Tape outlines the screen and the soundbar; the center is set by the seated eye line from the sofa.
4. The wall plate goes on with lag bolts into wood studs, or with fasteners made for steel studs plus a backer board where the metal is thin.
5. The TV is hung and locked, the tilt is set to reduce reflections from the window, and the soundbar bracket is fixed to the same framing.
6. The cords run into a raceway down to the existing outlet; nothing is cut into the shared wall.

Hardware and materials

• Tilting mount rated for 40–70 inch panels
• Lag bolts, washers and a plywood backer panel where needed
• Fasteners made for steel studs, if the probe hole shows metal
• Soundbar bracket with its own wall plate
• Paintable raceway, laser line and painter's tape

Add-ons often paired with this job

• Hide the wires inside the wall — +$90–$150. An in-wall rated kit is possible on the interior partition only, never on the wall shared with the neighbor.
• Full-motion (articulating) mount — +$30–$50. An arm would reach toward the stairs, which a compact room rarely allows.
• Take down an existing TV first — +$40–$80. An older TV is taken down as a separate line.

Why it is done this way

In an attached home the wall between two units is often a fire-rated separation, and the CC&Rs commonly limit holes in it. The scenario keeps the mount on an interior partition so the question does not come up.

A TV on a shared wall also sends bass into the neighbor's home. Many owners choose another wall for that reason alone.

The probe hole is the cheapest step in the job. It tells the installer whether the bolts are lag bolts or steel-stud fasteners and whether a backer board is needed before anything is hung.

The soundbar add covers the second bracket and the time to fix it into the same framing; it is part of the typical range here.

What would change the price

• The framing is steel and the thin metal needs a backer board across two studs.
• The interior wall has no outlet nearby, which is electrical work for an electrician.
• The association asks for notice or set working hours before the visit.
• A larger set moves the base range to the next size tier.
• The stairs make carrying a big box slow and add time.